What do the symbols on the multimeter mean?
Multimeter is engaged in electrical equipment, household appliances, electronic electrician necessary testing tools. Commonly used mechanical and electronic two kinds. In general, most of the mechanical selection of MF47 type, electronic digital multimeter models are particularly many.
The symbols commonly used in multimeter
① DCA → DC current → microampere (uA) → milliampere (mA) → ampere (A).
② DC Ⅴ → DC voltage → millivolt (m Ⅴ) → volt (Ⅴ).
③ AC V → AC voltage → volts (V).
④Ω → DC resistance → ohm (Ω)
→ kilohm (KΩ) → megohm (MΩ)
⑤ Pathway Buzzing→Buzzer sounds when below 10Ω.
⑥ capacitance measurement→C*0.1, C*1, C*10, C*100, C*1K, etc.
⑦ hFE→ transistor DC amplification.
⑧ dB→audio level→-10dB~+22dB, 0dB=1mw/600Ω.
MF47 Mechanical Usage;
Before use, you should check whether the pointer is in the mechanical zero position, such as not pointing at the zero position, you can rotate the zero adjuster on the cover of the table so that the pointer indicates the zero position. Then insert the red and black plugs of the test bar into the "+" and "-" jacks, such as measuring AC/DC 2500V or DC 10A, the red plugs should be inserted into the jacks labeled "2500V" or "10A". " or "10A" socket.
DC current measurement: When measuring 0.05-500mA, turn the switch to the desired current level. Measurement of 10A, the red plug "+" should be inserted into the 10A jack, turn the switch can be placed on the 500mA DC current limit, and then connect the test bar in series in the circuit under test.
AC and DC voltage measurement: When measuring AC 10-1000V or DC 0.25-1000V, turn the switch to the required voltage gear. Measurement of AC and DC 2500V, the switch should be rotated to the position of AC and DC 1000V, and then connect the test rod across the circuit under test. If equipped with a high-voltage probe, it can measure the high voltage of TV sets ≤ 25kV. Measurement, the switch should be placed on the 50uA position, high-voltage probe of the red and black plug were inserted into the "+", "-" socket, grounding clamps and TV metal plate connection, and then hold the probe for measurement. Measurement of AC 10V voltage, readings, please see the AC 10V special scale (red).
DC resistance measurement: install the battery (R14 type 2 # 1.5V and 6F22 type 9V each), turn the switch to the required resistance measurement gear, the test rod two short, adjust the ohm knob, so that the pointer is aligned with the ohm "0" position, and then separated from the test rod for measurement. Measurement of resistance in the circuit, you should first cut off the power supply, such as capacitors in the circuit should be discharged first. When checking the leakage resistance of polarized electrolytic capacitors, you can turn the switch to R × 1k file, the red rod of the test bar must be connected to the negative terminal of the capacitor, the black rod connected to the positive terminal of the capacitor. Note: When R×1k can not be adjusted to zero or the buzzer does not work properly, please replace the 2# (1.5V) battery. When the R×10k gear can not be adjusted to zero position, or infrared detection gear light tube brightness is insufficient, please replace the 6F22 (9V) laminated battery.
